PLZ HELP WILL GIVE BRAINLIEST

-9/10 or final option.

Step-by-step explanation:

We first can see what is.

Hint:

is equivalent to square root 81 over the square root 100.

The square root of 81 = 9.

The square root of 100 = 10.

Now, we can put it back into a fraction as 9/10.

Remember! We aren't done yet. We have to include our negative. Also, because it is outside the radical, we add it at the very end.

So our answer is -9/10 or the final option.

a) 15/7

step-by-step explanation:

idk man good luck man